Percival evbeitt



P. EVERITT.

Screw-Stock.

Patented May 11, 1880.

m. Im/w I W dig.

N PETERS. PHDTD-LITHQGRAPHER, WASHINGTON. D. C.

UNITED STATES PATENT OFFICE.

PERGIVAL EVERITT, OF GREAT RYBURGH, ASSIGNOR OF ONE-HALF OF HIS RIGHT TO FRANK WHEELER & 00., OF LONDON, ENGLAND.

SCREW- SPECIFICATION forming ater Letters Application filed September 3, 1879.

T all whom it may concern:

Be it known that I, PERGIVAL EVERITT, of Great Ryburgh, in the county of Norfolk, En gland, have invented certain new and useful Improvements in the Construction of Screw- Stocks, of which the following is a specification.

This invention relates to the adaptation to screw-stocks of the ordinary construction of IO the feeding and griping cam for which I obtained an American Patent hearing date the 19th November, 1878, No. 210,106. In the specification of this patent I described the feeding and griping cam (by which the moving die is propelled) as mounted on the side of a double-handled stock and actuated by a lever fitted thereto.

I now propose to mount the cam within the rectangular slot of the screw-stock instead of upon the stock, so that the strain of the cam when acting will be taken by the stock instead of by a pivot-pin, as in the arrangement above referred to.

In the accompanying drawings, my invenz 5 tion is shown as applied to an ordinary screwstock.

Figure 1 is a plan or side view of this modified form of screw-stock, and Fig. 2 is an edge view of the same. Fig. 3 shows the screwstock with the feeding and griping cam removed from the stock, and Figs. 4 and 5 show the cam detached in side and plan views.

A is the feeding and griping cam, in which an annular recess, a, is turned at the middle 5 of its length to receive the segment-shaped -rib b in the rectangular slot of the screw-stock B, which segment-shaped rib forms the bearing for the cam A.

STOCK.

Patent No. 227,508, dated May 11, 1880.

Patented in England November 29, 1878 O is a hand-lever fitted to'the hub of the cam for the purpose of giving an axial mo- 40 tion thereto and causing it to press upon or release from pressure the moving die.

D is the stationary die, and E the movable (lie, on the back of which the cam A bears for pressing that die up to its work.

This arrangement, it will be seen, possesses the special merit of throwing the strain directly upon the screw-stock instead of, as in my former arrangement, throwing the strain .upon a pivot-pin on the side of the stock.

To remove or change the dies it is only necessary .to slide the cam forward clear of the rib b. The cam is then free to drop out of the stock, and the dies may be readily withdrawn and replaced by others.

Having now explained the nature of my invention, I wish it to be understood that I claim- The combination, with a screw-stock having a slot to receive dies, one of which is movable therein, of afeeding and griping cam, substantially as described, having a bearing in the inner face of one of the Walls of said slot and adapted to act on the movable die, essentially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in the presence of the subscribing witnesses.

PEROIVAL EVERITT.

Witnesses:

H. K. WHITE, ALBERT IsoM,

Both of 66 Chancery Lane, London. 

